@isep.ipp.pt
Adjunct Professor at the Department of Physics
School of Engineering - Polytechnic of Porto (ISEP)
Condensed Matter Physics, Biomedical Engineering, Materials Science, Biomaterials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
M.F. Coelho, M.A. Rivas, G. Vilão, E.M. Nogueira, and T.P. Iglesias
Elsevier BV
T. P. Iglesias, G. Vilão, and João Carlos R. Reis
AIP Publishing
Assuming that a dielectric sample can be described by Debye's model at each frequency, a method based on Cole's treatment is proposed for the direct estimation at experimental frequencies of relaxation times and the corresponding static and infinite-frequency permittivities. These quantities and the link between dielectric strength and mean molecular dipole moment at each frequency could be useful to analyze dielectric relaxation processes. The method is applied to samples that follow a Cole–Cole or a Cole–Davidson dielectric function. A physical interpretation of these dielectric functions is proposed. The behavior of relaxation time with frequency can be distinguished between the two dielectric functions. The proposed method can also be applied to samples following a Navriliak–Negami or any other dielectric function. The dielectric relaxation of a nanofluid consisting of graphene nanoparticles dispersed in the oil squalane is reported and discussed within the novel framework.
M. C. Costa Lobo, Gustavo R. Alves, M. A. Marques, C. Viegas, R. G. Barral, R. J. Couto, F. L. Jacob, C. A. Ramos, G. M. Vilao, D. S. Covita,et al.
IEEE
The use of remote labs in undergraduate courses has been reported in literature several times since the mid 90's. Nevertheless, very few articles present results about the correspondent learning gains obtained by students, and in what conditions those systems can be more efficient, thus suggesting a lack of data concerning their pedagogical effectiveness. This paper addresses such a gap by presenting some initial findings concerning the use of a remote lab (VISIR), in a large undergraduate course on Physics, with over 550 students enrolled.
Gustavo R. Alves, M. A. Marques, C. Viegas, M. C. Costa Lobo, R. G. Barral, R. J. Couto, F. L. Jacob, C. A. Ramos, G. M. Vilao, D. S. Covita,et al.
IEEE
E. Pereira, G. Vilão, and R. Seitz
Elsevier BV